I have a box full of Mikuni 38mm carb parts and don't know how to match up parts for a complete carb set. I can get everything right except for the float bowls. For instance, the "E" and "H" bowls have different ways to flow fuel through the pilot jets. How can you know which bowl works with which body? I seem to run way too rich at idle with "E" bowls installed. Should the "H" or any other bowl make a difference?